The goal of this observational study is to explore early cognitive changes in patients aged 70 years or older undergoing same-day discharge after hip or knee replacement surgery. The main question it aims to answer is:
Does patients experience cognitive changes in cognitive test performance from before surgery to the first day after surgery?
Participants will:
* Complete a cognitive test battery virtually about 14 days before surgery, and on the first and seventh day after their operation. * Record pain levels and pain medicine use during the first week after surgery
Unilateral elective primary Total Hip Arthroplasty, Total Knee Arthroplasty, or Unicompartmental Knee
Native Danish speaker
Spinal anesthesia
Inability or unwillingness to provide informed consent
Inability to comply with virtual study procedures or follow-up sessions, including because of visual or hearing impairment
Known dementia or other diagnosed cognitive disorders or Brief Assessment of Impaired Cognition (BASIC)≤20
Parkinson's disease or other neurological conditions causing functional impairment